When comparing Plunker vs Glitch, the Slant community recommends Glitch for most people. In the question“What are the best web development playgrounds?” Glitch is ranked 6th while Plunker is ranked 9th. The most important reason people chose Glitch is:
You can embed Glitch apps anywhere on the web. Embed works easily with most blogging tools like Medium and Wordpress.
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Pros
Pro Test actual HTML files
You can sandbox your actual html files with a head section, script tags, etc.
Pro Fill size preview
Can open in a fill-sized web page like preview.
Pro Multiple files and file structure
You can simulate actual website structure allowing you to sandbox multiple file situations such as Angular rather than just a single concept such as "how do I make this div work better."
Pro Embed support
You can embed Glitch apps anywhere on the web. Embed works easily with most blogging tools like Medium and Wordpress.
Pro Git support
Each project has its own git repo hosted by Glitch. And you can export/import to Github.
Pro Easily fork projects with remix
Click "remix" to create a new copy of a project and edit instantly
Pro Run any node.js or simple web project easily from the browser
Pro Great community pens
Lots of excellent featured projects, click to "remix" to edit them yourself.
Pro Get help easily
The friendly "raise your hand" feature allows you to get help with your code from the community.